The process of turning something into gelatin or a gel-like substance, or coating something with gelatin.
From gelatin (from French gélatine, from Latin gelatus 'frozen') plus the suffix -ize (to make or become) and -ing (present participle). The word emerged in the 19th century as photography and food science developed.
Gelatinizing is how photographers in the 1800s created the first photographic plates—they'd coat glass with gelatin mixed with silver salts to capture images, literally turning light into frozen chemical reactions!
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